title: Amperometric determination of ascorbic acid in real samples using a disposable screen-printed electrode modified with electrografted o-aminophenol film.
abstract: Ascorbic acid (AA) is an antioxidant considered to play a crucial role in human health. Therefore, diverse methods for the determination of AA in foods have been developed, most of them time-consuming and requiring costly instrumentation. A simple and sensitive method for the quantification of AA in fresh fruits and vegetables and commercial juices using an amperometric sensor is presented on the basis of disposable screen-printed carbon electrodes (SPEs) modified with an o-aminophenol (o-AP) film selective for the detection of AA. The sensor exhibited a linear response for AA from 2-20 microM, with a correlation coefficient r2 = 0.998 and a limit of detection of 0.86 microM. Common possible interferents of the sample matrices were tested, and results showed high selectivity of the o-AP SPEs toward AA. The sensor exhibited an excellent reproducibility (RSD% = 1.98, n = 8) and surface stability. The method was validated by a comparison to a reference method, and excellent correlation is obtained.
authors.affiliation: Department of Chemical Engineering, Universitat Rovira i Virgili, Tarragona, Spain
authors.forename: Laia
authors.initials: L
authors.lastname: Civit
authors.forename: Hossam M
authors.initials: HM
authors.lastname: Nassef
authors.forename: Alex
authors.initials: A
authors.lastname: Fragoso
authors.forename: Ciara K
authors.initials: CK
authors.lastname: O'Sullivan
mesh_terms: D000627:Aminophenols; D000975:Antioxidants / Q000032:analysis*; D001205:Ascorbic Acid / Q000032:analysis*; D001628:Beverages / Q000032:analysis; D004566:Electrodes; D005504:Food Analysis / Q000379:methods*; D005638:Fruit / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014675:Vegetables / Q000737:chemistry
chemical_list: D000627:Aminophenols; D000975:Antioxidants; C027667:2-aminophenol; D001205:Ascorbic Acid